An incarceration museum on the spot of possibly the oldest prison in England.

Catacombs turned marketplace.

An unusual round church in London with a Templar past.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

Hidden beneath the streets of London is a secret subway that only carried mail.

At this beautifully preserved Pre-Hispanic site, you can see ancient petroglyphs with depictions of llamas and alpacas.

South America's oldest surviving locomotive.

A whimsical European-style chateau that calls the coast of Chile home.

A sliver of 19th-century Germany sits on the shore of a Chilean lake.

A charmingly unusual prefabricated metal church designed by Alexandre Gustave Eiffel.

This fairytale house on the shore of a Chilean Lake oozes an eclectic mix of Chilote and German Cultural heritage.

A display of hand-built replicas of the legendary vessels used by Patagonian and Antarctic explorers.

This bright yellow bridge is a true engineering feat.

Full-scale dinosaurs dominate the forested park in the middle of Chile’s second city.

The ruins of a grand theater destroyed during the most powerful seismic catastrophe ever recorded.

The geographical center of Chile is a port so depressing that it has driven men to suicide.

The gorgeous murals at this open-air museum form the largest street art collective in Chile.

A wooden dock art installation on Chiloé Island taps into the island's indigenous mythology.

This observatory high on a hilltop in the center of Santiago got its start in 1852.

This iconic hilltop church doubled as a lighthouse in the 19th century, guiding ships into the port of Valparaíso.

A 63-foot-tall swinging ball hypnotizes passersby, and proves to any remaining doubters that the Earth is spinning.

You can swim in these highly salty, mesmerizingly blue lakes in the Atacama Desert.

A fantastical and futuristic temple of light built from nine monumental glass veils.

One of the largest ancient geoglyphs in the world is a tall desert god used for predicting the weather.